Func trackchange

From Valve Developer Community

The title given to this article is incorrect due to technical limitations. The correct title is func_trackchange.

This Brush-based Entity is available in all Source Games.

Table of contents

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Entity Description

A brush entity that works as a rotating/moving platform that will carry a train to a new track. It must be larger in X-Y planar area than the train, since it must contain the train within these dimensions in order to operate when the train is near it.

Keyvalues

targetname <target_source>

Defines the name that other entities refer to this entity by.

hammerid [Episode Two Update]

<integer readonly> This id is used for debugging purposes in Hammer.

parentname <target_destination>

Specifies the targetname of this entity's Parent in a movement hierarchy. Child entities move with their Parent.

renderfx

Literal Value	Description
0	Normal
1	Slow Pulse
2	Fast Pulse
3	Slow Wide Pulse
4	Fast Wide Pulse
5	Slow Fade Away
6	Fast Fade Away
7	Slow Become Solid
8	Fast Become Solid
9	Slow Strobe
10	Fast Strobe
11	Faster Strobe
12	Slow Flicker
13	Fast Flicker
14	Constant Glow
15	Distort
16	Hologram (Distort + fade)
17	Scale up
22	Spotlight FX
23	Cull By Distance (TEST)
24	Fade Wider Pulse

rendermode

<choices> Used to set a non-standard rendering mode on this entity. See also 'FX Amount' and 'FX Color'.

Literal Value	Render Mode	Description (Click for more info.)
0	Normal	Default rendering.
1	Color	Obsolete.
2	Texture	Plain opacity.
3	Glow	No Z buffer checks. Fixed size on screen.
4	Solid / Alphatest	Obsolete. (Use alphatest capabilities in materials instead.)
5	Additive	Obsolete. Add this entity's color to what's behind it.
7	Additive Fractional Frame	Obsolete? Blend between animation frames.
8	Alpha Add (Not in FGD.)	Add alpha.
9	World Space Glow	No Z buffer checks. Fixed size in world (as opposed to on screen).
10	Dont Render / None	Don't render.

renderamt

<integer> FX Amount (0 - 255) - How opaque the entity will be rendered. (0 is fully transparent, while 255 is fully opaque). Will not work if the rendermode keyvalue is set to Normal or Dont Render.

rendercolor

<color255> FX Color - What color the entity will be rendered in (to the degree of the opacity set with renderamt).

globalname

<string> Name by which this entity is linked to another entity in a different map. When the player transitions to a new map, entities in the new map with globalnames matching entities in the previous map will have the previous map's state copied over their state.

movesnd

<choices> Move Sound.

Literal value	Description
0	No Sound
1	big elev 1
2	big elev 2
3	tech elev 1
4	tech elev 2
5	tech elev 3
6	freight elev 1
7	freight elev 2
8	heavy elev
9	rack elev
10	rail elev
11	squeek elev
12	odd elev 1
13	odd elev 2

stopsnd

<choices> Stop Sound.

Literal value	Description
0	No Sound
1	big elev stop1
2	big elev stop2
3	freight elev stop
4	heavy elev stop
5	rack stop
6	rail stop
7	squeek stop
8	quick stop

volume

<float> Sound Volume 0.0 - 1.0.

height

<integer> The vertical height above the track that the train moves. Negative values moves the train below.

rotation

<integer> The amount this platform should rotate as it moves, in degrees.

train

<target_destination> Train to Switch.

bottomtrack

<target_destination> Bottom Track.

_minlight

<string> The minimum level of ambient light that hits this brush.

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Flags

1 : Auto Activate train
2 : Relink track
8 : Start at Bottom
16 : Rotate Only
64 : X Axis
128 : Y Axis

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Inputs

Kill

Removes this entity from the world.

KillHierarchy

Removes this entity and all its children from the world.

AddOutput <string>

Evaluates a keyvalue/output on this entity. It can be potentially very dangerous, use with care.

Format: <key> <value>

Format: <output name> <targetname>:<inputname>:<parameter>:<delay>:<max times to fire (-1 == infinite)>

FireUser1-4

Causes this entity's OnUser1-4 outputs to be fired. See User Inputs and Outputs.

SetParent <target_destination>

Changes the entity's parent in the movement hierarchy.

SetParentAttachment <string>

Change this entity to attach to a specific attachment point on its parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment.

SetParentAttachmentMaintainOffset <string> [Episode One Update]

Change this entity to attach to a specific attachment point on it's parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. The entity will maintain it's position relative to the Parent's Origin and Angles at the time it is attached.